Constant-speed scrolling of a clip or still with FFmpeg's scroll filter

Guide ID: art_01M6VMFAG9H7H8TJ06D890DRRG

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Guide title

Constant-speed scrolling of a clip or still with FFmpeg's scroll filter

Coverage

For editors who want a moving banner, ticker or background made from a clip or still image with FFmpeg. You end up knowing which options control speed, direction and starting point, and how to check the result. It rests on the FFmpeg manual and filter source code; nothing was run, and the wrap-around behaviour comes from source only.

Example

A hypothetical wide banner image used as a ticker, tried at a small speed and then its negative to reverse it; it was not run, so no visual result is reported.

Useful starting points

• With default settings the filter should leave the picture still, so compare two frames if you see no motion.
• Apparent speed depends on frame rate and frame size, so re-tune the value after changing either.
• If you rely on content wrapping around at the edge, test an excerpt long enough to cross an edge; that behaviour comes from source code, not the manual.